# eclipse-cyclonedds/cyclonedds

Eclipse Cyclone DDS project

Repository: https://github.com/eclipse-cyclonedds/cyclonedds
Canonical: https://ross.abutalabs.com/products/cyclonedds
Homepage: https://projects.eclipse.org/projects/iot.cyclonedds
Language: C
License: NOASSERTION
License Family: other
Topics: dds
Last push: 2026-08-26T09:32:53+00:00

## Health v2 (maintenance only)
Score: 91/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 75, longevity 100
- inputs: {"age_days": 3165, "days_push": 7, "days_rel": 166, "gap_med": 28, "n_releases_24m": 2}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1327, forks 477 (observed 2026-08-28T04:04:22.848880+00:00)

## What it is
Eclipse Cyclone DDS is a performant, robust open-source C implementation of the OMG DDS (Data Distribution Service) publish-subscribe middleware specification. It serves as a tier-1 middleware for ROS 2 and includes an IDL compiler for defining typed data exchanged between distributed nodes.

## Use cases
- implement publish-subscribe messaging between distributed applications
- use DDS middleware for ROS 2 robot communication
- exchange typed data over the network with QoS policies
- build real-time distributed systems for IoT or embedded devices
- compile IDL data types into C code for DDS topics
- replace MQTT or message brokers with brokerless peer-to-peer messaging

## When to choose
- you need a standards-compliant, high-performance DDS implementation
- you are building ROS 2 applications and want a reliable tier-1 middleware
- you need brokerless, low-latency pub-sub with fine-grained QoS control
- you work in domains like robotics, aerospace, or industrial control requiring robust real-time messaging

## When to avoid
- you need simple request-reply HTTP APIs rather than pub-sub data distribution
- you want a lightweight message queue with a central broker and simple clients
- your team cannot work with C libraries or IDL tooling
- you need a managed cloud messaging service

## Facets
- artifact type: library
- maturity: stable
- function: message-queue, middleware, networking, serialization, rpc
- domain: microservices, iot, robotics
- platform: windows, cpp, python, cross-platform
- tags: dds, pub-sub, ros2, idl, eclipse-iot, data-distribution-service, real-time, messaging, linux, macos

## Member repositories
- eclipse-cyclonedds/cyclonedds (main) score 91

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:22.848880+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:46:16.725719+00:00, confidence not recorded.
  - readme: https://github.com/eclipse-cyclonedds/cyclonedds (fetched 2026-08-28T04:04:22.848880+00:00, sha 614f2b51309d)
  - homepage: https://projects.eclipse.org/projects/iot.cyclonedds (fetched 2026-08-29T12:05:31.239712+00:00, sha ca415e2a2906)
  - site_page: https://www.eclipse.org/org/workinggroups/about.php (fetched 2026-08-29T12:05:31.250871+00:00, sha 617d0404aabe)
  - site_page: https://projects.eclipse.org/projects/iot.cyclonedds/releases/0.7.0-coquette (fetched 2026-08-29T12:05:31.261311+00:00, sha 3ce6942796b1)
  - site_page: https://www.eclipse.org/collaborations (fetched 2026-08-29T12:05:31.249086+00:00, sha e85bba857bf3)
  - site_page: https://www.eclipse.org/collaborations/interest-groups (fetched 2026-08-29T12:05:31.252584+00:00, sha 0a842674cf43)
  - site_page: https://newsroom.eclipse.org/news/press-releases (fetched 2026-08-29T12:05:31.254281+00:00, sha e4dc7d5d1a30)
  - site_page: https://www.eclipse.org/org (fetched 2026-08-29T12:05:31.256200+00:00, sha 910b82ad62a4)
  - site_page: https://projects.eclipse.org/projects/iot.cyclonedds/releases/0.9.0-papillons (fetched 2026-08-29T12:05:31.257964+00:00, sha 4873b4cdcf74)
  - site_page: https://projects.eclipse.org/projects/iot.cyclonedds/releases/0.8.0-replique (fetched 2026-08-29T12:05:31.259737+00:00, sha 9c8561e49993)
- Data as of 2026-08-30T08:39:29.467469+00:00.